The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively:

A

-3.4 eV, -6.8 eV

B

3.4 eV, -6.8 eV

C

3.4 eV, 3.4 eV

D

-3.4 eV, -3.4 eV